જો a4 + 1/a4 = 50, a > 0, તો a3 + 1/a3 ની કિંમત શોધો.

1
\(\sqrt {2(1 + \sqrt {13} } ) + \left( { - 1 + 2\sqrt {13} } \right)\)
2
\(\sqrt {2(1 + \sqrt {13} } ) - \left( { - 1 - 2\sqrt {13} } \right)\)
3
\(\sqrt {2(1 + \sqrt {13} } )\left( { - 1 + 2\sqrt {13} } \right)\)
4
\(\sqrt {2(1 - \sqrt {13} } )\left( { - 1 + 2\sqrt {13} } \right)\)

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